The program lets users pick single or multiple pixel colors anywhere on the screen in more than 25 formats. The program supports picking colors from even dynamic content like DirectX. Its built-in color converter lets users convert colors from one color model/space/format to another easily. Color Picker Pro supports: RGB, HSB, HSL, CMYK, CIE XYZ, CIE Lab, CIE Luv, LCH, Yxy, YIQ, YUV, YCbCr, YCC, YPbPr, Hexadecimal, Photoshop, OLE, HTML, VC++, Visual Basic, and many other color formats. In addition, the program can automatically generate color variations for the picked colors: complement, inversion, contrast, brighter, darker, grayscale, and many others. Built-in zoom preview lets users magnify portions of the screen to pick the desired pixels right away. Color Picker Pro also provides freedom over how users can pick colors. Colors can be picked either by freely moving the mouse, or by first clicking and then dragging the mouse. Overall, it is advanced and feature-rich screen color grabber.
Source: http://www.binarymark.com/Products/ColorPickerPro/default.aspx